Folding box



Jan. 2, 1951 v r M. i. WILLIAMSON 2,536,990

FOLDING BOX 4 Sheets-Sheet 1 Filed Jan. 29, 1948 INVENTOR.

W BY M In. ATTORNEYS Jan. 2, 1951 M. 1. WILLIAMSON FOLDING BOX 4 Sheets-Sheet 2 Filed Jan. 29, 1948 Fig. 12

INVENTOR.

7.. JEN. W

. L) e .2 H

1, ATTORNEYS Jan. 2, 1951 M. I; WILLIAMSON ,9 0

poynm: BOX

Filed Jan. 29, 1948 4 Sheets-Sheet 3 INVENTOR. hag w 9-. law

'Qwaw UMMM ATTORNEYS Jan. 2, 1951 M. l. WILLIAMSQN FOLDING BOX 4 Sheets-Sheet 4 Filed Jan. 29, 1948 uvmvron. 734M U 14;. ATTOIVEYS Patented Jan, 2, 1951 FOLDING BOX Marshall I. signor to necticut Williamson, New Haven, Coma, as- National Folding Box Company, Inc.,

New Haven, Coma, a corporation of Con- Application January 29, 1948, Serial No. 4,980

8 Claims. i

This invention provides a novel and improved construction for boxes, cartons, trays or other receptacles made from paperboard, cardboard, or other foldable sheet material, hereinafter collectively referred to briefly as boxes" or folding boxes.

The invention has particular reference to folding boxes made from a single sheet of foldable sheet material in such a manner that only one side of the sheet is exposed to view in the finished box, which, therefore, may be constructed from sheet material decoratively finished on one side only, this one side forming both the inside I and the outside of the box.

Among other features, the invention provides an improved construction of a folding box having an integral main panel or platform for the support of merchandise elevated above the surface on which the box rests.

The invention is particularly applicable to boxes for the display of merchandise provided with a recessed interior merchandise supporting panel or platform.

Boxes incorporating-the present invention may be fabricated in part from out and scored box blanks glued on conventional gluing machines in such a manner that a tubular flat collapsed panel assembly results which may then be expanded and set up into hollow box form by a few simple folding operations requiring no mechanical equipment.

These and various other objects; features and advantages of the invention will appear more fully from the detailed description which follows accompanied by drawings showing, for the purpose of illustration, representative embodiments of the invention. The invention also consists in certain new and original features of construction and combination of elements hereinafter set forth and claimed.

Although the characteristic features of this invention which are believed to be novel will be particularly pointed out in the claims appended hereto, the invention itself, its objects and advantages, and the manner in which it may be carried out may be better understood by referring to the following description taken in connection with the accompanying drawings forming a part of it in which: I

Figure l is a plan view of a fiat cut and scored box blank incorporating the present invention;

Figure 2 shows the blank of Figure '1 after a gluing and folding operation resulting in a tubular blank structure ready for expansion into hollow box form; 1

Figure 3 is a perspective view of the blank of Figure 2 after expansion into hollow box form;

Figure 4 is a perspective view of the box in the process of folding of the end panels and shows the structure of Figure 3 at a further advanced state of completion; I

Figure 5 is a perspective view of the completed box;

Figure 6 is a sectional view of the box of Figure 5, the section being taken in plane 6-6 of Figure 1;

Figure '7 is a plan view of a blank for making a doubly recessed box structure;

Figure 8 is a perspective view of the box made from the blank of Figure 7;

Figure 9 is a sectional view of the box of Figure 8, a section being taken in plane 9-9 of Figure 8;

Figure 10 is a plan view of a blank for making a box having a recessed main panel and a hinged cover;

Figure 11 is a perspective view of the box made from the blank of Figure 10;

Figure 12 is a plan view of a flat cut and scored blank incorporating the present invention for making a box having scalable ends; and

Figure 13 is a perspective view of the blank shown in Figure 12 in the process of assembly.

In the following description and in the claims, various details will be identified by specific names for convenience. These names, however, are intended to be as generic in their application as the art will permit. Corresponding reference characters refer to corresponding parts in the several figures of the drawings.

In the drawings accompanying, and forming part of, this specification, certain specific disclosure of the invention is made for the purpose of explanation of broader aspects of the invention, but it is understood that details may be modified in various respects without departure from the principles of the invention and that the invention may be applied to other structures mmthe ones shown.

Referring to the drawings, the blank A in Figure 1 may be cut and scored in multiple from rolls or sheets of paperboard, cardboard, or other flexible sheet material. Only one side of the board need be imprinted or otherwise decoratively finished since only one side of the blank appears as the inside as well as the outside surface of the box. The blank may therefore be out from lined board having a finishing liner on one side only. In Figure l, the blank is shown in the position in which the unfinished surface faces the observer.

The blank is preferably laid out to have the grain of the stock run in the direction indicated in Figure 1 and comprises a, lower main panel an outer side wall panel l2, an inner side wall panel I3, an upper main panel or platform |4, an inner side wall panel l5, and an outer side wall panel l6 hingedly connected with one another along fold lines. l1, l8, I9, 20 and 2|. The lower main panel N forms the bottom of the finished box as will appear hereinafter and the upper main panel |4 forms a recessed merchandise supporting panel.

A glue lap 22 is hingedly connected to one side of the panel assembly, for example to the lower main panel along a fold line 23.

End flaps 24 and 25 are hingedly connected to the outer side wall panel i2 along fold lines 26 and 21 and a similar pair of end flaps 23 and 29 is hingedly connected to the outer side wall panel l6 along the fold lines 26 and 21.

Inner end wall panels 30 and 3| extend hingedly from either end of the upper main panel l4 along the fold lines 26 and 21. Outer end wall panels 3| and 33 extend hingedly from the inner end wall panels 30 and 3| along fold lines .34 and 35. Tuck panels 36 and 31 extend hingedly from the outer end wall panels 32 and 33 along fold lines 38 and 39.

Tuck fiaps 40, 4| extend hingedly from the side edges of the inner end wall panel 30 along fold lines l9 and 20' and a similar pair of tuck flaps 42 and 43 extends hingedly from the side edges of the inner end wall panel 3|.

The tuck flaps 40 and 4|, 42 and 43 are severed from the adjoining inner side wall panels l3 and i by cuts 44, 45, 46 and 41 substantially in line with the fold lines 26 and 21, respectively. They serve to maintain the side wall panels in upright position with respect to the main panel l4 as will presently appear.

The blank A of Figure l is pre-formed into tubular collapsed shape by applying adhesive a' to the finished side of the glue lap 22 and subsequent folding of the blank at fold lines I1 and 20 to bring the unfinished surface of the outer side wall panel i6 into adhesive engagement with the adhesive coated surface of the glue lap 22. The tubular blank A resulting from this gluing and folding operation is shown in Figure 2. The blank A can be shipped and stored in fiat collapsed condition thus requiring a minimum of space and may be expanded and completed into hollow box form by simple folding operations as will now be described.

In order to expand or square the tubular blank A pressure P is exerted against the edges l1 and 20 of the blank as indicated in Figure 2 causing the blank to open into hollow tubular shape. The upper main panel I4 is then depressed and is brought into approximately parallel position with respect to the lower main panel II by folding of the blank at fold lines i8, 2| and I9, 20, respectively. This folding operation brings the inner and outer side wall panels I3, I 2 and 5, i6, respectively, face to face with their unfinished surfaces, whereby side walls are formed which are of double thickness above the upper main panel i4 and of single thickness below the upper main panel I 4. The resulting structure is shown in Figure 3 and is ready for completion of the end walls.

The end walls are formed and the box structure is locked in final expanded shape by folding of the inner end wall panels 3|! and 3| about their respective fold lines 26 and 21 so that the inner end wall panels stand upright with respect to the upper main panel i4. During this folding operation, the tuck fiaps 40, 4|, 42 and 43, by reason of a certain degree of stiifness of their respective hinge lines, automatically slip between the inner and outer side wall panels l3, l2 and l5, l6, respectively, thereby locking the side walls of the box in upright position with respect to the main panel l4. The indicated direction of the grain of the stock makes the tuck flaps resistant to tear at the hinge lines.

The end flaps 24 and 28 as well as the end flaps 25 and 29 are then folded over the inner end wall panels 3|! and 3|, as indicated in Figure 4, and the outer end wall panels 32 and 33 then folded over the end fiaps 24, 28 and 25, 29, respectively. The outer end panels 32 and 33 are maintained in their final folded position by insertion of their respective tuck panels 36 and 31 into the space between the lower main panel I] and the lower edges of the end fiaps 24, 28 and 25, 29, respectively.

The finished box is shown in Figure 5 and comprises a contents supporting upper main panel which is recessed with respect to the upper edges i8, 2|, 34 and 35. The space between the upper main panel l4 and the lower main panel |I provides cushioning support for the box contents reducing shock exerted against the lower main panel I! forming the actual box bottom. This is particularly apparent from the cross sectional view of the box in Figure 6 illustrating also the double thickness side walls I 2, I3 and i5, i6 to either side of the upper main panel N.

In the completed box only one side of the blank is exposed to view, the reverse side of the blank being completely hidden.

Whereas the blank of Figure 1 forms a box having one recesesd main panel, it is, of course, possible to provide for a recessed arrangement of both main panels, or a platform of double thickness particularly suited for boxes for the packaging of merchandise of varying thickness, such as the packaging and display of cakes of soap, perfume or toilet water bottles.

Figure 7 illustrates a box blank from which a double recessed box may be made which is soconstructed that it may be used with either the shallower or the deeper recess facing upward.

The blank B is shown with its unfinished surface facing the observer and comprises an inner side wall panel 44, a first main panel 45, a further inner side wall panel 46, an' outer side wall panel 41, an inner side wall panel 48, a second main panel 49, a further inner side wall panel 50 and an outer side wall panel 5|. These panels are hingedly connected to one another along fold lines 52, 53, 54, 55, 56, 51 and 58. A glue lap 59 is hingedly connected to one side of the panel assembly, for example to the inner side wall panel 44 along a fold line 60.

Hook flaps 6| and 62 are hingedly connected to the outer side wall panel 41 along fold lines 63 and 64 and a similar pair of hook flaps 65 and 66 is hingedly connected to the outer side wall panel 5| along fold lines 61 and 68.

Inner end wall panels Hand 10 extend hingedly from either end of the first main panel 45 along fold line 1| and 12. A portion of the hinge formed by the fold lines 1| and 12 is cut by a shallow U-shaped out line 13, and 14 to provide elo gated narrow apertures at the ends of the first main panel for purposes described after.

Tuck flaps 15, 15, 11 and 18 extend hingedly .locking means for maintaining the side walls of the box upright with respect to the main panel as will later appear.

Inner end wall panels 19 and 90 hingedly extend from opposite ends of the second main panel 49 along fold lines BI and 82. These inner end wall panels have tuck flaps 83, 84, 85 and 8B hingedly connected to them along their side edges formed by the fold lines, 56 and 51.

Outer end wall panels 81 and" extend hingedly from the ends of the inner end wall panels 19 and 80, respectively, along fold lines 89, and 90. A further pair of inner end wall panels 9| and 92 is hingedly connected to the outer end wall panels 81 and 88 along fold lines 93 and 94. Lock tabs 95 and 96 are formed on the ends of the inner end wall panels 9| and 92. These look tabs fit into the apertures formed by cuts 13 and 14 at the ends of the main panel 45 and maintain the inner end panels 9| and 92 in assembled position.

The assembly of the blank B may proceed as follows.

Adhesive a, is first applied to the reverse finished side of the glue lap 59 and the blank. The blank is then folded at fold lines 53 and 51 whereby the unfinished surface of the outer end wall panel is brought into adhesive engagement with the adhesive coated surface of the glue lap 59.

A tubular flat collapsed blank results which may be stored and shipped in fiat condition and be expanded or set up into hollow box form by a few simple folding operations similar to the ones described in connection with the assembly of blank A.

Briefly, the tubular blank is so folded that the unfinished surfaces of the main panels 45 and 49 are brought face to face. Thus folded, the inner end wall panels 46 and 48 will lie face to face with the outer side wall panel 41 and the inner side wall panels 44 and 50 will lie face to face with the outer side wall panel 5|.

The tuck flaps 15 and 16 fit into the space between the side wall panels 44, 5| and 45, 41. respectively. Likewise the tuck tabs 11 and 18 fit into the space between the side wall panels 44, 5| and 46, 41, respectively.

Similarly, the tuck flaps 83 and 84 fit into the space between the side wall panels 41, 48 and 50, 5|, respectively, and the tuck flaps 85 and 86 at the opposite end of the box fit into the s ace between the side wall panels 41, 48 and 59, 5|, respectively. The eight tuck flaps maintain the side wall panels of the box upright with respect to the main panels 45 and 49, and slip into their respective spaces when the respective end panels are folded into upright position with respect to the main panels.

The'assembly of the end walls of the box proceeds by interlocking the pairs of hook flaps BI, 55 and 62, 66, respectively. These hook flaps also assist in maintaining the side walls erect and parallel and in addition maintain the several lock tabs inserted between the respective inner and outer side wall panels.

The outer end wall panels 81 and 88 are then folded over the hook flaps and finally the inner end wall panels 9| and 92 are folded over the inner end wall panels 69 and 10. In this position, the lock tabs 95 and 96 snap Into the aperherein- 6 tur'es formed by cuts 13 and 14 and lock inner end wall panels 9| and 92 in place.

The finished box is shown in Figures 8 and 9 and comprises a deep recessed portion for which the main panel 49 forms the merchandise supporting panel and a shallow portion for which the main panel forms the merchandise supporting panel. The box may thus be used for.the packaging articles of different thickness since it may be displayed either with a panel 49 or with a panel 45 facing upwardly. Also, articles may be shipped in the deeper portion of which the panel 49 forms the bottom and be displayed in the shallower portion after reversing the box to make panel 45 the merchandise supporting panel so that the merchandise partially protrudes above the upper edges of the box. In either position, the mer; chandise is resiliently carried on panels sp ced from the support on which the box rests.

Boxes employing the invention may, of course,

the

be equipped with lids or covers without sacrifice of the functional features provided by the in-.

vention.

The blank C shown in Figure 10 includes panels for forming a box cover. Except for the cover panels, the blank closely resembles the blank A shown in Figure 1. Primed reference numerals corresponding to' those of the .blank A have therefore been applied for identifying the several parts of the blank.

Except for the location of the glue lap 22', the blank C differs from the blank A in substance only by addition of a cover panel 91- hingedly connected to an outer side wall panel I6 along a fold line 98. Lateral flaps 99 and I00 extend from the cover panel 91 along fold lines 26' and 21 and an end flap IN is hingedly connected to the cover panel 91 along a fold line I02.

The uper main panel I4 has an aperture I03 cut therein through which a portion of the merchandise to be packaged may extend into the space below the upper main panel. Such protruding parts may be the winding stems of a clock, for example.

The assembly of the blank C into box form proceeds quite similarly as the assembly of the blank A. The glue lap 22 is adhesively attached to the outer side wall panel I6 leaving the cover panel assembly to protrude beyond the glued side wall panel I5. The setting up of the tubular blank into hollow box form corresponds to the procedure illustrated in Figures 3 to 5.

The completed carton with the cover panel half closed is shown in Figure 11. The lateral flaps 99 and I00 and the end flap IOI are insertable into the inside of the box and the width of the three flaps is preferably so selected that the end edges of the flaps 99, I00, and IM come to rest on the panel I4 when the lid is fully closed.

Whereas the invention has been described as applied to boxes of the tuck-end type, the invention is not limited to such boxes, but may be embodied in glue end boxes as will now be described.

The blank D shown in Figure 12 comprises an upper main panel I04, an inner side wall panel I05, an outer side wall panel I06, a lower main panel I01, an outer side wall panel I08, an inner side wall panel I09 and a terminal glue flap IIO hingedly connected to one another along fold lines III, H2, H3, H4, H5 and H6. The

lower main panel I01 forms the bottom of the ,and the upper main panel I04 forms a merand I22 is hingedly connected to the outer side wall panel I08 along the fold lines I I9 and I20. Inner end wall panels I23 and H4 extend hingedly from either end of the upper main panel I04 along the fold lines IIS and I20. Intermediate end wall panels I 25 and I26 extend hingedly from the ends of the lower main panel I01 along the fold lines I I9 and I20, respectively. Outer end wall panels I21 and I28 extend hingedly from the inner end wall panels I23 and I24 along fold lines I29 and I30.

Tuck panels I3I and I32 extend hingedly from the inner end wall panels I23 and I24 along the fold line III and a further pair of tuck panels I33 and I34 extend hingedly from the sides of the inner endwall panels I 23 and I24 along fold lines I36 and I31.

Assembly of the blank D into carton form may proceed as follows: Adhesive a is applied to the terminal glue fiap II as indicated in Figure 12 and the blank is then folded about the fold line II4 to bring the side wall panels I08 and I 09 face to face with the lower main panel I01. In this position, the coating of adhesive faces upwardly. The blank is then folded about the fold line III. This brings a marginal portion of the upper main panel I04 into adhesive engagement with the terminal glue fiap H0 and a tubular blank is thus formed.

The tubular blank is then folded in a manner corresponding to the folding of the previously described blanks A, B and C to form double side walls and a double bottom and the tuck panels I3I, I33, and I32, I34 are inserted into the spaces between the inner and outer side wall. This occurs practically automatically when the inner end panels I23 and I24 are foldedinto upright position with respect to the main panels.

The resulting box is shown in perspective in Figure 13. In order to bring out the characteristic construction of the end walls, the end wall forming flaps and panels are shown in outfolded position, a position which the panels and flaps need not necessarily assume when the carton is being folded.

The completion of the end walls may then proceed by folding of the end fiaps H1 and I2I over the inner end wall panel I23, folding of the intermediate end wall panel I 25 thereover, followed by downfolding of the outer end wall panel I21 over the intermediate end wall panel I25, adhesive being applied to the fiaps and panels at appropriate areas. The completion of the opposite carton end wall may proceed correspondingly.

The sealing operations formed on the carton end walls correspond in general to the operations performed on the type of box generally referred to in the trade as seal end box, thus making it possible to use conventional sealing machines for this purpose. In structure, however, the box end dilfers from the conventional seal end structure in that an inner end wall panel is present, in the illustrated embodiment the panels I23 and I24 which are not present in the conventional seal end box.

The invention thus provides a novel and highly useful type of folding box which is inexpensive to make from a minimum of board, which may be glued on simple automatic machinery, and be assembled by performance of a few folding operations. The peculiar corner, side and end wall construction gives the box a degree of strength and rigidity not commonly found in boxes of similar form.

Obviously, the invention is not restricted to the representative forms herein shown and described but may, with equal benefit, be applied to other forms of boxes adapted for a great many different uses. Thus various additions, omissions, substitutions, modifications and other changes may be made without departing from the spirit and the essence of the invention.

What is claimed is:

1. A folding box made from a tubular blank of foldable sheet material and comprising, an upper main panel; a lower main panel; side wall forming panels adapted to befolded face to face to form side walls, at least partially of double thickness, said side wall forming panels being hingedly connected to said main panels along the sides of said main panels; end wall forming panels adapted to be folded face to face to form an end wall, at least partially of double thickness, said end wall forming panels being hingedly connected to at least one of said main panels along its end edge; first flaps hingedly extending from the inner thiokness of said end wall forming panels, said tuck fiaps being insertable between the two thicknesses of said side walls by folding of the end, wall panels about said end edge, the maximum radial dimension of said first flaps, measured from the intersection of said end-edge with the hinge line of the respective first flap, being less than the height of the side wall above said intersection, considering the box in assembled position; and second flaps hingedly extending from the outer thickness of said side wall forming panels, said second fiaps being foldable into face-to-face position with said end wall forming panels.

2. A folding box made from 'a tubular blank of foldable sheet material and comprising, an upper main panel, a lower main panel; side wall forming panels adapted to be folded upon themselves to form side walls, at least partially of double thickness, said side wall forming panels being hingedly connected to said main panels along the sides of said main panels; end wall forming panels adapted to be folded upon themselves to form end walls, at least partially of double thickness, said end wall forming panels being hingedly connected to at least one of said main panels along main panel end edges; sectorshaped tuck flaps hingedly extending from the sides of said end wall forming panels, said tuck fiaps being insertable between the two thicknesses of said side walls by folding of the end wall panels about a main panel end edge, the maximum radial dimension of said tuck fiaps measured from the corner of the main panel bordered by said end edge being less than the height above said last named main panel of the respective side wall into which the respective tuck flap is to be inserted; and side flaps extending from side edges of certain side wall forming panels, said side flaps being foldable into parallel position with said end wall forming panels and insertable between the thickness of the end wall forming panels.

3. A folding box made from a tubular blank of foldable sheet material and comprising, two substantially parallel main panels interconnected by side walls, said side walls being at least partially of double thickness and extending from the side edges of said main panels, end walls at least partially of double thickness extending from end edges of said main panels; first side flaps hinged to side edges of certain Wall panels adapted to be inserted between the two thicknei'es of other walls for maintaining the side walls erect with respect to said main panels, the maximum radial dimension of said side flaps, measured from that end point of their respective hinge lines which is farthest from the top edge of the box wall into which the respective flap is to be inserted, being less than the height of said box wall above said end point, considering the box in assembled condition; and second side flaps hingedly connected to the edges of the outer thickness of the wall into which said first side flaps are to be inserted, said second side flaps being foldable into face-to-face position with said certain wall panels.

4. A folding box made from a tubular blank of foldable sheet material and comprising, an upper main panel; a lower main panel; side wall forming panels adapted to be folded to form side walls at least partially of double thickness, said side wall forming panels extending hingedly from said main panels along the sides of said main panels; end wall forming panels adapted to be folded to form end walls at least partially of double thickness, said end wall forming panels hingedly extending from the ends of certain of said main panels; flaps hingedly extending from the inner thickness of certain end wall panels insertable between the two thicknesses of the side walls, the maximum radial dimension of said flaps measured from the respective corner of the upper main panel being less than the height of the side wall measured from the upper main panel; and flaps hingedly extending from the outer thickness of certain side wall panels insertable between the two thicknesses of the end walls.

5. A folding box made from a tubular blank of foldable sheet material and comprising, an upper main panel; a lower main panel; side wall forming panels adapted to be folded upon themselves to form, at least in part, double thickness side walls, said side wall forming panels extending hingedly from said main panels along the sides of said main panels; end wall forming panels adapted to be folded upon themselves to form. at least in part, double thickness end walls, said end Wall forming panels extending from the ends of certain main panels; flaps hingedly extending from the inner thickness of certain end wall panels insertable between the two thicknesses of the side walls to maintain the side walls erect; and an end tab on said end wall forming panels, said end tab being insertable into the space between said two main panels, the maximum radial dimension of said hinged insertable flaps measured from the respective corner of the upper main panel being less than the height of the side wall measured from the upper main panel.

6. A folding box made from a tubular blank of foldable sheet material and comprising, an upper main panel; a lower main panel; side wall forming panels adapted to be folded upon themselves to form, at least in part, double thickness side walls, said side wall forming panels extending hingedly from said main panels along the sides of said main panels; end wall forming panels adapted to be folded upon themselves to form, at least in part, double thickness end walls, said end wall forming panels extending from the end of certain main panels; flaps hingedly extending from the inner thickness of certain end wall panels insertable between the two thicknesses of the side walls to maintain the side walls erect; and hook flaps hingedly extending from the outer thickness of certain side wall panels, said hook flaps being foldable face to face with said end walls, the maximum radial dimension of said hinged insertable flaps measured from the respective corner of the upper main panel being less than the height of the side wall measured from the upper main panel.

7. A folding box made from a tubular blank of foldable sheet material and comprising, an upper main panel; a lower main panel; side wall forming panels adapted to be foldable upon themselves to form, at least in part, double thickness side walls, said side wall forming panels extending hingedly from said main panels along the sides of said main panels; end wall forming panels adapted to be folded upon one another and to be adhesively secured together to form multiple thickness end walls, said end wall forming panels extending from the ends of certain main panels; flaps hingedly extending from the inner thickness of certain end wall panels insertable between the two thicknesses of the side walls to maintain the side walls erect; and an end tab on certain of said end wall forming panels, said end tab being insertable into the space between said two main panels, the maximum radial dimension of said insertable flaps measured from the respective corner of the upper main panel being less than the height of the side wall measured from the upper main panel.

8. A folding box made from a tubular blank of foldable sheet material and comprising, an upper main panel; a lower main panel; side wall forming panels adapted to be folded upon themselves to form, at least in part, double thickness side walls, said side wall forming panels extending hingedly from said main panels along the sides of said main panels; end wall forming panels adapted to be folded upon one another and to be adhesively secured together to form multiple thickness end walls, said end wall forming panels including an inner end wall panel hingedly extending from an end of said upper main panel, a second end wall panel hingedly extending from said inner end wall panel, a third end wall panel hingedly extending from said lower main panel, end flaps hingedly extending from the outer thickness of certain side wall panels, said end flaps being securable between certain of said end wall panels; and flaps hingedly extending from said inner end wall panels, said flaps being insertable between the two thicknesses of the side walls, the maximum radial dimension of said last named flaps measured from the respective corner of the upper end panel being less than the height of the side wall measured from the upper main panel.

MARSHALL I. WILLIAMSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number 

